automatically set para->useStreams to false for single gpu

Anna Wellmann authored 3 years ago and Anna Wellmann committed 3 years ago

(cherry picked from commit fc68e403)

in Parameter.cpp

Find all send and recv indices which also are interface cells fine to coarse, coarse (iCellFCC).
Move them to the front of the vector of send and recv indices. Return their number as well.

To avoid compiler errors, the destructor of Parameter must be defined in Parameter.cpp

Previously, the event was also triggered when data was written. This behavior caused crashes of VF